AME AME5131AEEVADJZ

AME, Inc.
Low Power
DC/DC Boost Converter
AME5131
n General Description
The AME5131 is a high-frequency boost converter dedicated for LCD bias supply and white LED applications for
cellular phone backlighting, PDAs, and other hand-held
devices. The part can also be used to generate standard
3.3 V/5 V to 12 V power conversions.
The AME5131 has an internal 400mA switch current
limit, offering lower output voltage ripple. The 32µA low
quiescent current together with an optimized control
scheme, allows device operation at high efficiencies and
maintains long battery lifetime. AME5131 uses SOT-25
package and gives a small size solution.
n Function Block Diagram
On / Off Time
Controller
UVP
SW
VIN
_
Boost
Controller
+
FB
Bandgap
Driver
+
_
GND
Enable
Soft Start
EN
n Features
l 0.6Ω Internal Switch
n Typical Application
l 1.8V to 5.5V Input Range
l Adjustable Output Voltage Up to 28V
l Input Under Voltage Protection
l 32µA Typical No Load Quiescent Current
5 V
IN
l SOT-25 Package
Standards
D1
VOUT
VIN ~28 V
1.8 V-5.5 V
l 1µA Shutdown Current
l All AME's Lead Free Products Meet RoHS
L1
10μH
VIN
SW
AME5131
CIN
4.7μF
FB
4
EN
GND
1
R1
2.1M
CFF
22PF
CO
1μF
3
2
R2
150K
n Applications
l White LED Back-Lighting
l Hand-held Devices
l Digital Cameras
l Portable Applications
l Internet Audio Player
l LCD Bias Power
l Standard 3.3 V/5 V to 12 V Conversions
1
AME, Inc.
Low Power
DC/DC Boost Converter
AME5131
n Pin Configuration
SOT-25
Top View
5
AME5131AEEV
4
1. SW
2. GND
AME5131
3. FB
4. EN
1
2
5. VIN
3
* Die Attach:
Conductive Epoxy
n Pin Description
Pin Number
2
Pin Name
Pin Description
1
SW
This is the switch pin and is connected to the drain of the internal
NMOS power switch. Minimize the metal trace area connected to this
pin to minimize EMI.
2
GND
Ground Pin.
3
FB
Feedback Input Pin.
Connect this pin to the external voltage divider to program the desired
output voltage.
4
EN
Enable Control Input Pin. (Active High)
5
VIN
Input Supply Pin.
Place bypass capacitor as close to VIN as possible.
AME, Inc.
Low Power
DC/DC Boost Converter
AME5131
n Ordering Information
AME5131 x x x x xxx x
Special Feature
Output Voltage
Number of Pins
Package Type
Operating Ambient Temperature Range
Pin Configuration
Pin
Configuration
A
(SOT-25)
Operating Ambient
Package Type
Temperature Range
Number
of
Pins
Output Voltage
E: -40OC to +85OC
V: 5
ADJ: Adjustable
1. SW
2. GND
3. FB
4. EN
5. VIN
E: SOT-2X
Special Feature
Z:
Lead free
n Ordering Information
Part Number
Marking*
Output Voltage
Package
Operating Ambient
Temperture Range
AME5131AEEVADJZ
BEFww
ADJ
SOT-25
-40OC to +85OC
Note: ww represents the date code and pls refer to Date Code Rule page on Package Dimension.
* A line on top of the first letter represents lead free plating such as BEFww.
Please consult AME sales office or authorized Rep./Distributor for the availability of package type.
3
AME, Inc.
Low Power
DC/DC Boost Converter
AME5131
n Absolute Maximum Ratings
Parameter
Symbol
Maximum
VIN
6
VEN , VFB
VIN
VSW
30
Input Supply Voltage
EN, FB Voltages
SW Voltage
Unit
V
C*
ESD Classification
Caution: Stree above the listed absolute maximum rating may cause permanent damage to the device.
HBM C: 4000V+
n Recommended Operating Conditions
Parameter
Symbol
Rating
Ambient Temperature Range
TA
-40 to +85
Junction Temperature Range
TJ
-40 to +125
Unit
O
C
n Thermal Information
Parameter
Package
Die Attach
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
SOT-25
Conductive Epoxy
Internal Power Dissipation
Maximum
Unit
θJC
81
o
C/W
θJA
260
o
C/W
PD
400
mW
Maximum Junction Temperature
150
o
C
Solder Iron (10 Sec)**
350
o
C
* Measure θJC on center of molding compound if IC has no tab.
** MIL-STD-202G210F
4
Symbol
AME, Inc.
Low Power
DC/DC Boost Converter
AME5131
n Electrical Specifications
VIN = 2.4V, EN = VIN, TA = -40oC to 85oC, typical values are at TA = 25oC
Parameter
Input Voltage
Symbol
Test Condition
VIN
Min
Typ
1.8
Max
Units
5.5
V
Quiescent Current
IQ
IOUT = 0mA, not switching, VFB = 1.3V
32
50
Shutdown Current
ISD
EN = GND
0.1
1
FB Pin Bias Current
IFB
VFB = 1.3V
Feedback Trip Point
VFB
1.8V ≦ VIN ≦ 5.5V
UVP Voltage
UVP
µA
1
1.187
1.212 1.237
V
1.5
1.7
V
400
450
mA
ICL
VOUT = 18V, IOUT = 10mA, TA=25oC
RDSON
VIN = 2.4V; ISW = 200mA
0.6
1
Ω
SW leakage current
ISW
VSW = 28V
1
10
µA
Switch Off Time
t OFF
400
ns
Switch On Time
t ON
6
µs
EN Input Current
IEN
EN = GND or VIN
EN Input Threshold (High)
VEH
Device Active
EN Input Threshold (Low)
VEL
Device Shutdown
Switch Current Limit
Switch RDSON
Line Regulation
REGLINE
Load Regulation
REGLOAD
1.8≦VIN ≦5.5V; VOUT =18V;
ILOAD =10mA; Cff = not connected
VIN =2.4V; VOUT =18V;
0mA≦IOUT≦30mA
350
0.1
1
1.3
µA
V
0.4
V
0.3
%/V
0.15
%/mA
5
AME, Inc.
AME5131
n Detailed Description
Operation
The AME5131 is a boost converter with a smart control
scheme that operates in a pulse frequency modulation
(PFM) with constant peak current control.
The smart control schemes utilize a reference voltage,
minimum off-time, maximum on-time and current-limited
control scheme. The switch turns off as the inductor current reaches the internally set peak current of 400mA
(typical). The second criteria that turns off the switch is
the maximum on-time of 6µs (typical). As the switch is
turned off the external Schottky diode is forward biased
delivering the current to the output. The switch remains
off for a minimum of 400 ns (typical), or until the feedback
voltage drops below the reference voltage.
Using this PFM peak current control scheme the converter operates in discontinuous conduction mode (DCM)
where the switching frequency depends on the output
current, which results in high efficiency over the entire
load current range. This regulation scheme is inherently
stable, allowing a wider selection range for the inductor
and output capacitor.
Soft-start
Soft-start is provided on the AME5131 to minimize inrush current. All inductive boost converters exhibit high
inrush current during start-up if no special precaution is
made. This can cause voltage drops at the input rail during start up and may result in an unwanted or early system shut down.
The soft-start time is set by increasing the current limit
in two steps starting from 100mA for 256 cycles to 200mA
for the next 256 cycles, and then full current limit.
6
Low Power
DC/DC Boost Converter
AME, Inc.
Low Power
DC/DC Boost Converter
AME5131
Efficiency vs Output Current
Efficiency vs Input Voltage
90
100
Io=5mA
90
80
VIN =5.0V
Io=10mA
70
V IN =3.6V
70
Efficiency (%)
Efficiency(%)
80
V IN =2.4V
60
50
40
30
50
40
30
20
20
10
10
0
60
0
1
0
1.8
100
10
2
2.5
3
3.5
4
4.5
Output Current (mA)
Input Voltage (V)
VOUT vs IOUT
VOUT vs VIN
19
5
5.5
6
20
18
I OUT=10mA
17
V IN =2.4V
19
VO UT (V)
VOUT (V)
16
15
14
18
13
17
12
11
10
0.1
1
10
16
1.8
100
IOUT (mA)
2
2.5
3
3.5
4
4.5
5
5.5
6
VIN (V)
Quiescent Current vs Input Voltage
Feedback Voltage vs Temperature
1.240
60
TA =85 C
50
40
Feedback Voltage (V)
Quiescent Current (µA)
1.235
o
TA =25oC
30
TA =-40oC
20
1.230
1.225
1.220
1.215
1.210
1.205
1.200
1.195
1.190
1.185
10
1.2
1.8
2.4
3
3.6
4.2
4.8
Input Voltage (V)
5.4
6
6.6
1.180
-40
-20
0
20
40
60
80
100
120
Temperature (oC)
7
AME, Inc.
Low Power
DC/DC Boost Converter
AME5131
RDSON vs Temperture
RDSON vs Input Voltage
1000
1200
900
800
700
800
RDSON (mΩ)
RDSON (mΩ)
1000
600
400
600
500
400
300
200
200
100
0
-20
-10
0
10
20
30
40
50
o
60
70
80
90
0
1.8
2.4
3
3.6
4.2
4.8
Temperature ( C)
Input Voltage (V)
Load Transient Response
Line Transient Response
VIN
5.4
6
3.4V
2.4V
VOUT
100mV/div
VOUT
100mV/div
10mA
IOUT
1mA
200µS/div
200µS/div
Start Up Behavior
5V/div
1V/div
VOUT
50mA/div
EN
I IN
Time
8
AME, Inc.
Low Power
DC/DC Boost Converter
AME5131
n Date Code Rule
Marking
Date Code
Year
A
A
A
W
W
xxx0
A
A
A
W
W
xxx1
A
A
A
W
W
xxx2
A
A
A
W
W
xxx3
A
A
A
W
W
xxx4
A
A
A
W
W
xxx5
A
A
A
W
W
xxx6
A
A
A
W
W
xxx7
A
A
A
W
W
xxx8
A
A
A
W
W
xxx9
n Tape and Reel Dimension
SOT-25
P
W
AME
AME
PIN 1
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
SOT-25
8.0±0.1 mm
4.0±0.1 mm
3000pcs
180±1 mm
9
AME, Inc.
Low Power
DC/DC Boost Converter
AME5131
n Package Dimension
SOT-25
Top View
Side View
SYMBOLS
D
L
MIN
E
H
MILLIMETERS
θ1
S1
1.20REF
A
A
10
0.0472REF
0.15
0.0000
0.0059
b
0.30
0.55
0.0118
0.0217
D
2.70
3.10
0.1063
0.1220
E
1.40
1.80
0.0551
0.0709
1.90 BSC
e
θ1
A1
b
MAX
0.00
2.60
S1
0.07480 BSC
3.00
0.37BSC
L
Front View
MIN
A1
H
e
MAX
INCHES
0
o
10
0.95BSC
0.10236 0.11811
0.0146BSC
o
0
o
10
0.0374BSC
o
www.ame.com.tw
E-Mail: sales@ame.com.tw
Life Support Policy:
These products of AME, Inc. are not authorized for use as critical components in life-support
devices or systems, without the express written approval of the president
of AME, Inc.
AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and
advises its customers to obtain the latest version of relevant information.
 AME, Inc. , July 2006
Document: 1115-DS5131-A.01
Corporate Headquarter
U.S.A.(Subsidiary)
AME, Inc.
Analog Microelectronics, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District
Taipei 114, Taiwan, R.O.C.
Tel: 886 2 2627-8687
Fax: 886 2 2659-2989
3100 De La Cruz Blvd., Suite 201
Santa Clara, CA. 95054-2046
Tel : (408) 988-2388
Fax: (408) 988-2489